At current, the indicators for checklist items are green colours when completed, red colours when overdue, and yellow colours when they are nearing completion.
If a checklist item is marked complete it will revert to the green colour. However, this does not differentiate between items which were completed before their due date and items which were completed after their due date.
Is it possible to assign some indicator so that checklist items which overran their due date, and have since been completed, can be identified as having overran their due date?